API 5-1 / 2 ″ LC FLOAT COLLAR MANUFACTURER Chaw Tsim Tshuaj Xa
1. Lub rooj zaum thiab lub rooj sib tsoo valve tuaj yeem tiv thaiv qhov grout los ntawm kev ntws rov qab.
2. Tsis-rotating tsaws daim av muaj nyob ntawm kev thov.
3.Cov PDC lossis cov pob zeb drillable.
Sau koj cov lus ntawm no thiab xa rau peb